PHP Programing language

In PHP is to increment (add 1 to) or decrement (Subtract 1 from ) values. Mainly there are more type to write a syntax for incrementing and decrementing like as:


<?php
$a=1;
$a=$a+1;
?>
//If you using shortcut assignment operator += like as:
<?php
$a=1;
$a += 1;
?>
//And another way using for incrementing values: 
 the ++ operator, which you use like this:
<?php
$a =1;
$a++;
?>

Similarly this process is same way to work for decrement.

Note:If you using the ++ or -- operator after a variable, then the value in the variable is incremented after the rest of the statement is executed. If you put ++ or -- in front of a variable, the value in that variable is incremented or decremented before the rest of the statement is executed.

Operator	Name	Effect
++$a	Pre-Increment	Increments $a by 1, then returns $a.
$a++	Post-Increment	Returns $a, then increments $a by 1.
--$a	Pre-Decrement	Decrements $a by 1, then returns $a.
$a--	Post-Decrement	Returns $a, then decrements $a by 1.

Example for Increment and Decrement


<html>
<head>
<title>Increment or decrement</title>
</head>
<body>
<?php
$a = 10;
echo 'Value of $a is :'.$a;
echo '<br />After Pre-increment value of $a ( i.e. ++$a ) is: '.++$a;
$a = 20;
echo '<br />Value of $a is :'.$a;
echo '<br />After Post-increment value of $a ( i.e. $a++ ) is: '.$a++;
$a = 30;
echo '<br />Value of $a is :'.$a;
echo '<br />After Pre-decrement value of $a ( i.e. --$a ) is: '.--$a;
$a = 40;
echo '<br />Value of $a is :'.$a;
echo '<br />After Post-decrement value of $a ( i.e. $a-- ) is: '.$a--;
?>
</body>
</html>